Ventilator



Patented July 1 4 1925 UNITED STATES PATENT OFFICE. j

'VENTILATOR.

Application filed April 19, 1923. Serial No. 683,128.

To all whom it may concern."

Be it known that I, CLARENCE SUNDAHL, a citizen of the United States, residing at Kansas City, in the county of Jackson and 5 State of Missouri, have invented certain new and useful Improvements in Ventilators; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art 1 to which it appertains to make and use the same, reference being bad to the accompanying drawings, and to, the figures of reference marked thereon, which form a part of this specification.

and the primary objectis to provide an improved form of cowl having an eduction tube and louvers so constructed. that the louvers will pass the maximum amount of atmospheric air to provide the maximum siphonic action on the eduction tube so that the air will be drawn from the building.

In the construction of a ventilator cowl it is desirable to pass as much air as possible 55 through the louvers and to permit the atmospheric air and the air drawn from the building to pass through the cowl to outside atmosphere.

My invention particularly relates to the louvers which are so designed that a maximum amount of air can be received at the entrance end of the louvers, as will be clearly disclosed in the following description in connection with the accompanying drawings, in which Fig. 1 is an elevati-onal view of a ventilator cowl constructed in accordance with my invention.

Fig. 2 is a vertical, sectional view oi the same, and

Fig. 3 is abottom plan view.

Referring now to the drawings by numerals of reference:

1 designates the eduction pipe about which is a fluted casing 2. The flutedcasing is supported in spaced relation with respect to the tubel by radial partitions 3, the flutes being formed angular so that the partitions, the wall of the tube land the casing form a circular series of pentagonal openings or passageways 4 and since the casing is in the form of a fluted cone,

This invention relates to ventilating cowls the passageways are of progressively de creasing port areas from the bottom to the top.

The casing extends above the tube 1 and provide a rain guard 5. At the base of the flange 5 is a truncated. conical ring 6,

forming a deck with a depending flange 7. In spaced relation with the deck 6 and supported above it by the bracket 8 is a conical cap 9 carrying on its inner face an inverted cone 10. The partitions 8 terminate at about the top of the eduction tube 1. I

Since the port areas of the passageways 4- progressively decrease from the bottom to the top, it will be apparent that a large amount of air will enter the inlet or lower ends ofthe passageways 4 and in order to pass into the space above the eduction tube, the velocity of the air will be increased. Consequently, there will be an injector action causing a siphonic efl'ect on the air within the eduction tube so that the foul air and the fresh air will ascend and pass through the space 11 between the deck 7 and the cap 9, the lower ends of the partitions 3 extending below the casing so that they will arrest the horizontal stream lines of air and direct them into the passageways 4-..

In actual practice I have found the device to be highly eflicient, simple to construct and well adapted to perform the service for which it: is intended. 7

What I claim and desire to secure by Letters-Patent is:

A ventilator'cowl comprisingan educ-.

CLARENCE SUNDAHL.

terminates in an outwardly flared flange to 

